void*  memset(void *mem, int c, unsigned size);
void* memcpy(void *dst, const void *src, unsigned size);

char* strcat(char* strDest, const char* strSource);
int strcmp(const char* string1, const char* string2);
char* strcpy(char *strDest, const char *strSource);
char* strncpy(char *strDest, const char *strSource, unsigned n);
int strlen(const char* string);